#8063: improve user-visible error message for InsertAtCursorEffect brick

[twschiller]

What does this PR do?

• Closes Improve error message from Insert Text at Cursor brick #8063
• Update message: "Error inserting text at cursor. Ensure there is a focused editor in the target frame"

Checklist

• Add tests and/or storybook stories
• Designate a primary reviewer: @grahamlangford

[codecov]

Codecov Report

Attention: Patch coverage is 92.85714% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 73.18%. Comparing base (17c212b) to head (403591d).

❗ Current head 403591d differs from pull request most recent head 6771ded. Consider uploading reports for the commit 6771ded to get more accurate results

Files	Patch %	Lines
src/bricks/effects/InsertAtCursorEffect.ts	85.71%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8069   +/-   ##
=======================================
  Coverage   73.18%   73.18%           
=======================================
  Files        1310     1310           
  Lines       40722    40747   +25     
  Branches     7567     7568    +1     
=======================================
+ Hits        29801    29821   +20     
- Misses      10921    10926    +5     

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[github-actions]

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